If this thread already exists delete.but I guess we're to believe all transformers that survived DOTM that weren't in AOE were killed by lockdown and he took there sparks but why did he take them ??? For his masters or for his personal gain?
Now that you mention it, perhaps for his masters. OR as there Spark contains their everything perhaps that is how he acquired their tech, which he didn't use.
I was thinking for upgrades like in animated or extra power, it never shows him put it anywhere else except in his arm in the movie on screen.